Paul Yock is the Martha Meier Weiland Professor of Medicine and Mechanical Engineering (by Courtesy) and Director of the Center for Research in Cardiovascular Interventions at Stanford. He is also Director of Stanford's Program in Biodesign.

The main focus of Dr. Yock’s research program has been in the field of intravascular ultrasound. Dr. Yock is internationally known for his work in inventing, developing and testing new devices, involving the Rapid Exchange ™ balloon angioplasty system, which is now the dominant system in use worldwide. He developed a Doppler-guided hypodermic needle system , and the Smart Needle ™ and P-D Access ™.